1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14
10 // <optional>
11 
12 // ~optional();
13 
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 using std::optional;
21 
22 struct PODType {
23   int value;
24   int value2;
25 };
26 
27 class X
28 {
29 public:
30     static bool dtor_called;
31     X() = default;
32     ~X() {dtor_called = true;}
33 };
34 
35 bool X::dtor_called = false;
36 
37 int main(int, char**)
38 {
39     {
40         typedef int T;
41         static_assert(std::is_trivially_destructible<T>::value, "");
42         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
43         static_assert(std::is_literal_type<optional<T>>::value, "");
44     }
45     {
46         typedef double T;
47         static_assert(std::is_trivially_destructible<T>::value, "");
48         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
49         static_assert(std::is_literal_type<optional<T>>::value, "");
50     }
51     {
52         typedef PODType T;
53         static_assert(std::is_trivially_destructible<T>::value, "");
54         static_assert(std::is_trivially_destructible<optional<T>>::value, "");
55         static_assert(std::is_literal_type<optional<T>>::value, "");
56     }
57     {
58         typedef X T;
59         static_assert(!std::is_trivially_destructible<T>::value, "");
60         static_assert(!std::is_trivially_destructible<optional<T>>::value, "");
61         static_assert(!std::is_literal_type<optional<T>>::value, "");
62         {
63             X x;
64             optional<X> opt{x};
65             assert(X::dtor_called == false);
66         }
67         assert(X::dtor_called == true);
68     }
69 
70   return 0;
71 }
72